Mouth guard



FIG. 1 is a top left perspective view for a mouth guard showing my new design;

FIG. 2 is a bottom left perspective view thereof;

FIG. 3 is a front side view thereof;

FIG. 4 is a back side view thereof;

FIG. 5 is a top side view thereof;

FIG. 6 is a bottom side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof;

FIG. 9 is a sectional view taken along lines 9-9 from FIG. 3 thereof; and,

FIG. 10 is a back left perspective view. 

CLAIM The ornamental design for a mouth guard, as shown and described. 